My mom's been postmenopausal for five years and she's bleeding.

Menopause 5 years of sudden bleeding is considered to be endometrial cancer, ovarian cancer, endometrial lesions or endometrial polyps caused. It is recommended to do gynecological examination, if it is caused by endometrial cancer, need timely surgery, postoperative also need to be through radiotherapy, chemotherapy and other ways of adjuvant treatment. Usually to keep the perineum clean.